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Ok probably stirring up the pot . I installed a propane injection unit on my 6v92ta,total cost about $1100. Has been in for 1 year. You can turn it on or off at any time from the drivers seat.My son and I did a test on a controlled route with a hill in the test. Each time I gained an extra gear and lost 10 seconds off the route test with the propane on. We did the test 3 times on and 3 times off, the same each time.It has given me the extra power needed for the up hill runs.I turn it off when not in the hills.I have the regulator set low on the amount of propane injected. The only difference I have noticed is I use a little less oil on a long run.As far as long term use time will tell. At present we only put on about 8-10 k a year. dave

Your preaching to the choir Dave,, its well known that propane "mixing" (its not injected) works well for turboed and "A" timed engines. Propane is even more effective on 4 stroke diesel engines than 2 strokes..>>>Dan

This is something I have always had an interest in although I do not have a turbo. Many reports seem to say it helps a natural engine, just not quite as much. There are those that create their own systems using a steady flow of propane. I have also heard about systems that can regulate the propane flow according to the DD blower, which would be similar to the turbo system.

You will probably find more water vapor in despensed diesel fuel than propane vapor. Internal combustion averages between 14/17 to 1 for efficient combustion,, thats a lot of air to work with, particularly under blower pressure.>>>Dan